Power punch



J, L. KOMAIK 1,774,833

Sept. 2, 1930.

Filed Feb. 26,- 1927 I N VEN TOR.

ATTORNEY.

Patented sent. 2, 19 30 r em; I h i l ing in which refsentiinyentioiig relate s t0 iinproverfo ting-metal.

.t grieL-un ef sur ace of t e pl ge a w s wheflunlde iifiwhi l is hrholes counter; nkQatthe up- Q p ce these hlolesthe punches-provided with hezids fitting into the countersinks, ,The plates are I then bolted-together and to the under face of the plunger proper. :In, such constructions,

1'5 whenever a punch breaks vor needs tobere placed'for any reesom lt lsnecessary to remove thetwo plates andpu'nches n order that one or more may; be changed. '7

' I Among theobjects of the present invention 9 is to overcome this difficulty a'ndiprovide apunch mounting which will permit changing a punch without dismantling the-press.

Another objectis such a mounting that 4 positivelylocks the punch in place yet permits its quick removal and replacement when,

' necessary.

Other objects will readily appeer' to those skilled in the art upon reference to the followin descri tion-andaccom an in drawsv c i Fig. 1 is an elevation e portionofe punch :press-enddie plate involving. the pres- .ent invention;

to be secured to the plunger of punch press is shown at 10. In ordinary construction. thisis a plain flat plate, but-in the present construction it will be provided with' 'cylindrical recesses ll' in which are to belo'cated plugs 12 of hardened steel themselves each provided with s recess- 13 in its cylindrical 7 face and drilled-in the bottom of the recess 13 for the reception of an angular locking pin JOSEPH Koi/mmor imiters, MICHIGAN on 'Thisfpinli prefeiablylfzp I other "hardenedsteelend sharpfene'djsiti one 1.: I 1 end, ;The p111 holeis preferablydrilled at v I an angle to-ithe d zimeter as shown and the-pin 1s"bent slightly to prevent turning in theholeu j Theunder s d'efof plugfl V 12 h s cross grooved -d1an' etriczgllv asf'etflfl-i .7 es shown injF g}. lfor a purpose {to be" d e-Q.

iupuii chejs, particulei ly punches "gi inifi h o mount the punches in the lbot ejp s pl nes byjs urmg against"prejssurejilugs' the bushingsbe ing held against turning by pins; 26; Y I Iow-' f ever, without means to fix the punchesposi- V Fig. 2 is an enlzirged section through the topview of the punch and bush I Pad Qdin w 5 21a mountedflillers froni the usual 'pzid' in being'counter s'unk at-the" upper endsiof thejpunch holes with a' taperingcoiintersink bushing 25 threzided internally to receive the threaded'upper endofpunch Iith; theftw'o I'ateSYIO ah-d 264105111 01 q gether a ndto uiefprsspm er,pimches e-i be" screwed up into 'bushin'gs: '25 and 1:

2'2 andjin this is ede' otedto fitie taperedgsplit i tively"in plece the litter are-Eipt itojwork loose andfth'erefore i'neans'is [providedi-to' .lock the punches in place; -This'" means is,

preferably one thatfpe rmits removal of the v n punchjwhendesired and'iirtheformshown consists of; a' frengible e'lement' 'suches wire I 35;"the grooves 15' andia' coacting gjro'ove 36" ,1

in the upper erid 'olf punchfll." letter groove 36 is preferablyrectangularend of Its width should slightly less -"the n the ,jVlIG diameter. *The'grooves 1'5ere prefer ably curved in section on ebout'the 'r'aidius oft'h'e wire. 5:. i 1 m HWireW35 iszpleced iii-groove "36 and: the

punch "21 inserted iniitsopeningiandvscrewed ,intobushing; 25, when the upper'end of the punch iapproeches itplug 12,1116 slight clear: once ibovethe la'tt e'rperinits itto lift enough adepth somewhat lessthan thedialmetei; of wire 35"butgreater'th2tn theradiusthereof;

and the friction in; ,socketa11 holds it fIOIII,"

turning suificiently to allowthe wire togmove intoon of the i grooves "15. The. plug. 12 is; 7

then .rotzited with. h the i punch ."21 until the p I g '7 dricalv rotatable pressure. recelv ng v plug, I mea ns-.-to .prevent rotation of saidplug 1n latter cannot'be inoved any further. This 7 squeezes the wire "into.grooves 15 and 36 and thereby locks the punchjand plug to- "gether and thethus formed unit cannot turn in the reverse direction because of the lockfingpin 14. Y

- ;I n order-tofacilitate "moval of the; punches,,it is preferred to mill 7 vj short v grooves in the latter so that a suit.-

.ablc wrench the Wire dropsout. On account of this func tion, it isfobvi'ous' that the wire 35 should 'be comparatively soft. I

the setting and rethereto. v

,i( no,t show n) maybe applied 1 In the drawing 5llfindicates aconventional e die-plate adapted tore-operate with the Y p unjches 21'. l

' lIILIVing, nowdescribd 'the in ention and thepreferred form of embod ment thereof t is tobe understood thatthe said invention is-;to be limitcdmot to thespecific details herein set. forth and illustrated but-only by the scope f theIclaimswhich follow. YI claimfe 1..In a punch-press, a punch holder providedin itslower side with an-inserted cylinone direc ti on, aipu-nch pad provided with. a

punch receivingiiop ening adaptedto align wvith saidplug when-said holder and pad are secured" together, saidopening being countersunk: at its upperfend, an internally threaded bushing in said countersink, a threadedlpunch ,adaptedfto' screw into said 1-bushing,"and means co-connect the punch and 2. In a punchpressp'a punch holder. pro- Vided initslowerside with an inserted cylindrical rotatable" pressure receiving plug, means to prevent rotation of said plug in one direction, apjunchl pad provided with a punch receivingqopening 'adapted to align with said plug when saidholderand pad are secured together, said opening having a tapering countersink at'its upper end, a correspondingly tapering internally 7 threaded bushing in said. countersink. a threaded punch adaptedto screw 'injtojsaid bushing and means 7 j to fconnect the punch and plug.

.3.,In a punchpress,ifa punch holder provided in its lower'side with an inserted cylindrical, rotatable pressure receiving plug,

' means to.v prevent, rotationof said plug in .onedirection, a punch pad provided with a punch receiving opening,adapted to align with 'said plug when said holder and: pad are secured together, said opening being countersunk atfits upper endyaninternal'l y threaded bushing in said countersink, a

' threaded punch adapted to screw into said bushing and means to connect the punch and plug, said connecting means comprising diametrical grooves in the upper surface of said punch, diametrical' grooves in the lower face of said plug and a short piece of comparatively soft wire of such size as to form a connecting tongue for the opposed grooves.

4:. In a punch press, a punch holder pro vided in its lower side with an inserted cylindrical rotatable pressure receiving plug, means to prevent rotation of said plug in one direction, a punch pad provided with a punch receiving opening adapted to align with said plug'whensaid holder and pad are secured together, said opening having a tapering countersink at its upper end, a correspondingly tapering internally threaded bushing insaid countersink. a threaded punch adapt ed to screw into said bushing and meansto connect thepunch and plug, said connecting means comprising diametrical; grooves in the upper surfaces of said punch, diainetrical' grooves in the lower face of said plug and a short piece of comparatively soft wire of such size as to form a connecting tongue for the opposed grooves. 1 u I r 'JQSEPH L. KOMAR.

ion

for; 

